Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 28,676	$ 20,701	$ 51,233	$ 37,477
Other comprehensive income:
Change in fair value of derivatives net of reclassification to interest expense	2,421	(3,726)	(1,566)	(5,655)
Total comprehensive income	31,097	16,975	49,667	31,822
Comprehensive income attributable to noncontrolling interest	(156)	(103)	(242)	(194)
Comprehensive income attributable to common shareholders	$ 30,941	$ 16,872	$ 49,425	$ 31,628